Well-casing perforator.



A. C. GRAHAM.

WELL CASING PERFORATORW APIPLICATION mm R 21. 1915.

Patent-ed Nov. 30, 1915.

ilili l/Vl/ENTUR WITNESSES:

A TTOR/VE Y8 err s raws PATENT area.

ALBERT C. GRAHAM, OF BARTLESVILLE, OKLAHOMA.

Y WELL-CASING PERFORATOR.

To all whom it may concern:

Be it known that I, Anmcn'r C. GRAHAM, a citizen of the United States, and a resident of Bartlesville, in the'county of \Vash- -ington and State of Oklahoma, have inof perforating devices forming the subject of Letters Patent No. 1,070,336 granted to me August 13, 1913, and No. 1,125,513 granted to me January 15, 1915. In these patented devices perforating elements in the form of wheels are employed, presentingradial perforating arms, the wheels being arranged to be given vertical movement relatively to the supporting body of the perforator. The trunnions of the wheels operate in guide slots inclined to the axis of the body, and the arrangement is such that in the vertical movement of the wheels, the guide slots cause a lateral movement of the wheels, so that the lateral perforating arm thereof is forced against and through the well casing. In Patent No. 1,125,518

' the perforating arms are disposed in pairs,

each pair being carried by hnks which are tilted in the perforating movement so that the wheels are moved laterally in opposite directions. In PatentNo. 1,070,336 a plurality of perforating wheels are moved successively through the medium of individual elevators interposed between and alternating with the indivldual wheels.

The prime object of the present invention is to provide a perforator of the character described employing a plurality of wheels, and to provide for actuating the same with-- out the employment of individual elevators for individual wheels, whereby the construction is greatly simplified and a more direct and positive perforating movement is imparted to the wheels. This object, and others, as will appear as the description pr'ogresses, are accomplished by arranging the wheels in pairs associated with links,

as in th latter patent referred to, but empl ing a single elevator disposed between the respective pairs of links and wheels,as hereinafter more particularly explained.

7 Reference is had to the accompanying drawings forming part of this specification, in which similar characters of reference in Specification of Letters Patent.

Application filed April 21, 1915. Serial No. 22,794.

Patented Nov. 36), 1915.

dicate corresponding parts in all the views, and in which:

Figure 1 is a sectional elevation showing my improved perforator, the well casing being shown in vertical section; Fig. 2 is a detail vertical section on a larger scale on the line 2-2, Fig. 1; and Fig. 3 is a transverse section on the line 3-3 Fig. 2.

The present construction, in common with the two patented constructions referred to, comprises an elongated body 10 having a threaded stem 11, or equivalent means whereby to raise and lower the same in a well casing 12. At the lower end of the body a spindle or rod 13 is vertically movable and depends from said body. On the rod 13 is a frictional holding device 14 presenting spring arms to engage the sides of the Well casing 12, as described in my patents referred to. Also the present construction, like the patented ones, includes a latch 15 near the lower end of the rod 13 adapted to be moved with the rod through thewlower collar 16 of the retaining device 14;.

In practice the perforator is lowered in the casing 12 to the location where the perforating is'to be effected and is then drawn upward sufficiently to locate the latch 15 above the collar 16 after which the sup porting body 10 of the perforator is lowered relatively to the rod 13. The body 10 has friction rollers 17, 18 thereon to facilitate themovement in the well casing. In the body 10 openings 19 are provided extending from side to side and ranging at the vertical center of the body, and in the side walls of the opening 19 oblique slats 19 are produced which receive the trunnions 22 of the perforating wheels. Said wheels present aseries of radial arms 20 emanating from a hub 21. The trunnions 22 of the wheels are carried in hearings in side links 23 with a pair of links for each pair of wheels, one wheel of a pair being positioned in the links at the upper ends and the other wheel at the lower ends of the links. The openings 19 are at right angles to each other so that the upper perforating wheels-and their links 23 will be disposed at right angles to the wheels and links below.

The rod 13 at its upper end is formed with a head 24 on which the links 23 of the lower perforating wheels rest. Interposed between the upper and lower pairs of perforating wheels I provide an elevator 25 in the form of a rod orspindle having a head' '26 and an upper head 27. The heads 26 and 27 as well as the head 24. are formed with transverse end grooves 28 receiving the perforating arms of the wheels and permitting contact between the heads and the hubs 21 of thevarious wheels. The elevator has sliding vertical movement in a. corresponding central orifice or bore 29 in the body 10 so that the head 26 lies in thelower transverse opening 19 and the upper head 27 lies in the upper transverse opening 19. It will thus be seen that the upper links 23 rest on the elevator at the upper end of the latter, and that said elevator at its lower end extends directly adjacent I to the hub 21 of the upper perforating wheel of the lower pair; also that the lower perforating wheel of the lower pair lies adjacent to the head 24 of the spindle or rod 13. l/Vith the described arrangement, when the rod 13 has its latch 15 above the collar 16-, so that the frictional holding device 14 will sustain theperforator in the well casing and the supportlO has been moved up wardly, a downward movement of the said support on the rod 13 will cause the head 24 of said rod to give a relative upward movement to the lower links 23. The upward movement of the lower links 23 will carry the elevator 25 upwardly and the elevator in turn will give an upward movement to the upper pair of links 23. In the relative upward movement of the respective links the slots 19 will tilt said links and force the perforating wheels of each pair of links outwardly in opposite directions to perforate the well casing 12. It will thus be seen that a single elevator together with the acan elevator interposed between the upper and lower links and movable relatively to the support, said elevator engaging at its upper end with the upper links and engaging at its lower end with the lower links, and means movable relatively to the support below the lower links to give vertical movement to the latter in the said support.

2. Ina well casing perforator, a support adapted to be received in a well casing, per- I forating devices arranged in pairs, one pair above the other, means connecting and carrying the perforating devices of a pair and adapted to tilt laterally to give a lateral movement to said devices, an elevator interposed between the upper and lower carryingmeans and capable of vertical movement relatively to the support, and means below the lower carrying means to give vertical movement thereto in the support.

In testimony whereof I have signed my name to this specification in the presence of. two subscribing witnesses.

ALBERT C. GRAHAM.

Witnesses:

JAS. P. EASTERLY, LEWIS M. ASHER. 

